US9076646B2 - Plasma enhanced atomic layer deposition with pulsed plasma exposure - Google Patents
Plasma enhanced atomic layer deposition with pulsed plasma exposure Download PDFInfo
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- US9076646B2 US9076646B2 US14/144,107 US201314144107A US9076646B2 US 9076646 B2 US9076646 B2 US 9076646B2 US 201314144107 A US201314144107 A US 201314144107A US 9076646 B2 US9076646 B2 US 9076646B2
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- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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Definitions
- PEALD plasma enhanced atomic layer deposition
- a single cycle of a PEALD process deposits a monolayer of material. The operations may be repeated a number of times to deposit additional monolayers to reach a desired film thickness.
- a method for filling a gap on a semiconductor substrate surface including: (a) introducing a first reactant in vapor phase into a reaction chamber having the substrate therein, and allowing the first reactant to adsorb onto the substrate surface; (b) purging the reaction chamber after a flow of the first reactant has ceased; (c) introducing a second reactant in vapor phase into the reaction chamber while the first reactant is adsorbed onto the substrate surface; (d) exposing the substrate surface to plasma to drive a surface reaction between the first and second reactants on the substrate surface to form a film layer that lines the gap, where the plasma is a pulsed plasma; (e) extinguishing the plasma; and (f) purging the reaction chamber.
- the frequency of the plasma pulses during exposing the substrate surface to plasma is between about 25-5000 Hz.
- the frequency of plasma pulses may also be between about 100-500 Hz.
- the frequency of plasma pulses is at least about 25 Hz, for example at least about 50 Hz or at least about 100 Hz or at least about 1000 Hz.
- Various different types of film may be deposited according to the disclosed methods.
- the film deposited is a silicon nitride or silicon carbonitride film.
- the film may be an oxide film in some cases.
- operations (c) and (d) occur, at least partially, at the same time.
- Different types of plasma may be used.
- the plasma may be a capacitively coupled plasma or an inductively coupled plasma.
- the plasma may be generated using an RF plasma generator.
- a plasma power may be between about 50-2500 W/station.
- a ratio between a wet etch rate at a middle portion of a sidewall of the gap (WEm) and a wet etch rate at a top (WEt) and/or bottom (WEb) of the gap is between about 0.25-3.
- the film formed in the gap at a middle portion of the gap, as measured vertically, may exhibit a wet etch rate between about 1-25 ⁇ /min.
- An average ratio of carbon:silicon at a sidewall of the gap may be at least about 0.4, for example at least about 0.5 or 0.6. This relatively high carbon:silicon ratio contributes to the relatively low wet etch rate seen at the sidewalls.
- a composition of the film is substantially uniform throughout the film.
- the method further includes repeating operations (a) through (f).
- a first iteration of operation (d) is performed at a different pulse frequency than a second iteration of operation (d).
- a first iteration of operation (d) may be performed at a different duty cycle than a second iteration of operation (d).
- a first iteration of operation (d) may be performed at a different RF power than a second iteration of operation (d).
- a pulsed plasma is used.
- the plasma pulses between an on state and an off state.
- the plasma may pulsed between at least a first power state and a second power state, where power delivered during the first power state is different from power delivered during the second power state.
- an apparatus for depositing films on substrates including: a reaction chamber; an inlet port for delivering gas phase reactants to the reaction chamber; a plasma generator for providing pulsed plasma to the reaction chamber; and a controller having instructions for: (a) introducing a first reactant in vapor phase into the reaction chamber; (b) introducing a second reactant in vapor phase into the reaction chamber; (c) periodically striking a pulsed plasma to expose the substrate surface to pulsed plasma when the vapor phase flow of the first reactant has ceased in order to drive a surface reaction between the first and second reactants on the substrate surface to form the film.
- the controller has instructions for pulsing the plasma during operation (c) at a frequency between about 25-5000 Hz.
- the controller may have instructions for performing operations (b) and (c) at least partially at the same time.
- the controller may also have instructions for performing operation (c) at a plasma duty cycle between about 5-95%.
- the controller may have instructions for repeating operations (a) through (c), where the controller also has instructions for performing a first iteration of operation (c) at a different pulse frequency and/or duty cycle and/or RF power than a second iteration of operation (c).
- FIGS. 1A-1D show graphs depicting the atomic concentration of various species present in a film deposited in a trench at different positions within the trench.
- FIG. 1E shows various graphs depicting how different plasma characteristics change over time during a plasma pulse cycle.
- FIGS. 2A and 2B are flowcharts for methods of depositing a film on a substrate through a plasma enhanced atomic layer deposition method according to certain disclosed embodiments.
- FIG. 3 is a simplified diagram of an apparatus for depositing a film on a substrate according to certain disclosed embodiments.
- FIG. 4 shows a multi-tool semiconductor processing apparatus for depositing a film on a substrate in accordance with certain disclosed embodiments.
- FIGS. 5A and 5B show cross-sectional views of a trench having a conventional film deposited thereon, both as-deposited ( FIG. 5A ) and after an etching operation ( FIG. 5B ).
- FIG. 5C is a table showing the etch rate at different portions of the conventional film shown in FIGS. 5A and 5B .
- FIGS. 6A and 6B show cross-sectional views of a trench having a novel film thereon deposited according to the disclosed methods, both as-deposited ( FIG. 6A ) and after an etching operation ( FIG. 6B ).
- FIG. 6C is a table showing the etch rate at different portions of the novel film shown in FIGS. 6A and 6B .
- FIGS. 7A and 7B are presented in color and show areal density maps illustrating the carbon:silicon ratio in films deposited with a continuous wave plasma ( FIG. 7A ) and with a pulsed plasma ( FIG. 7B ).
- semiconductor wafer semiconductor wafer
- wafer semiconductor wafer
- substrate substrate
- wafer substrate semiconductor substrate
- partially fabricated integrated circuit can refer to a silicon wafer during any of many stages of integrated circuit fabrication thereon.
- a wafer or substrate used in the semiconductor device industry typically has a diameter of 200 mm, or 300 mm, or 450 mm.
- the following detailed description assumes the invention is implemented on a wafer. However, the invention is not so limited.
- the work piece may be of various shapes, sizes, and materials.
- other work pieces that may take advantage of this invention include various articles such as printed circuit boards and the like.
- Manufacture of semiconductor devices typically involves depositing one or more thin films on a non-planar substrate in an integrated fabrication process. In some aspects of the integrated process it may be useful to deposit thin films that conform to substrate topography. For example, a silicon nitride film may be deposited on top of an elevated gate stack to act as a spacer layer for protecting lightly-doped source and drain regions from subsequent ion implantation processes.
- CVD chemical vapor deposition
- silicon nitride film on the non-planar substrate, which is then anisotropically etched to form the spacer structure.
- mass transport limitations of CVD gas phase reactions may cause “bread-loafing” deposition effects. Such effects typically exhibit thicker deposition at top surfaces of gate stacks and thinner deposition at the bottom corners of gate stacks.
- mass transport effects across the wafer surface may result in within-die and within-wafer film thickness variation. These thickness variations may result in over-etching of some regions and under-etching of other regions.
- a feature is a gap recessed in the surface of a substrate, for example a gap in one or more films deposited on a substrate.
- the aspect ratio of a feature is defined as the ratio between the feature's depth to its width. As device dimensions continue to shrink, aspect ratios increase and CVD processes are unable to adequately fill such features.
- ALD atomic layer deposition
- CVD chemical vapor deposition
- P 1 first film precursor
- Some molecules of P 1 may form a condensed phase atop the substrate surface, including chemisorbed species and physisorbed molecules of P 1 .
- the reactor is then evacuated to remove gas phase and physisorbed P 1 so that only chemisorbed species remain.
- a second film precursor (P 2 ) is then introduced to the reactor so that some molecules of P 2 adsorb to the substrate surface.
- the reactor may again be evacuated, this time to remove unbound P 2 .
- thermal energy provided to the substrate activates surface reactions between adsorbed molecules of P 1 and P 2 , forming a film layer.
- the reactor is evacuated to remove reaction by-products and possibly unreacted P 1 and P 2 , ending the ALD cycle. Additional ALD cycles may be included to build film thickness.
- each ALD cycle may deposit a film layer of, in one example, between about 0.5-3 ⁇ thick.
- Conformal films may also be deposited on planar substrates.
- antireflective layers for lithographic patterning applications may be formed from planar stacks comprising alternating film types. Such antireflective layers may be approximately 100-1000 ⁇ thick, making slower ALD processes less attractive than faster CVD processes. However, such anti-reflective layers may also have a lower tolerance for within-wafer thickness variation than many CVD processes may provide. For example, a 600 ⁇ thick antireflective layer may tolerate a thickness range of less than 3 ⁇ .
- CFD processes may be employed.
- Methods for forming films using CFD are described in U.S. patent application Ser. No. 13/084,399, filed on Apr. 11, 2011, and which is incorporated by reference herein for all purposes.
- CFD processes use surface-mediated deposition reactions to deposit films on a layer-by-layer basis.
- CFD does not rely on complete purges of one or more reactants prior to reaction to form the film.
- plasma activation of deposition reactions may result in lower deposition temperatures than thermally-activated reactions, potentially reducing the thermal budget of an integrated process.
- the embodiments herein include both plasma enhanced ALD (PEALD) and CFD processes.
- PEALD plasma enhanced ALD
- FIGS. 1A-1D present data from an Auger analysis related to the composition of a film deposited in a trench on a substrate according to a conventional PEALD method.
- the x-axis relates to different locations on the substrate. “Top” refers to a position in the field region near the top of a recessed feature, “Side 1 ⁇ 2” refers to a position halfway up the sidewall, and “Side 1 ⁇ 4” refers to a position one-quarter of the way up the sidewall (closer to the bottom of the feature than the top).
- the y-axis relates to the atomic concentration of the element of interest (silicon in FIG. 1A , nitrogen in FIG. 1B , carbon in FIG. 1C , and oxygen in FIG. 1D ).
- FIG. 1D shows that the concentration of oxygen in the film is much higher at the sidewall locations than in the field region.
- FIGS. 1A-1D contain references to “RBS” values. These correspond to Rutherford Backscattering data performed to verify the Auger analysis.
- the RBS data relates only to the film at the top of the feature.
- the embodiments herein relate to methods in which the plasma is pulsed (e.g., RF power is turned on and off or otherwise modulated many times) during this conversion operation.
- conventional PEALD methods are sometimes described as “pulsed plasma” methods, a distinction should be drawn between these conventional pulses and the pulses of the current embodiments.
- conventional PEALD methods use a single pulse (plasma on, plasma off) during a plasma exposure/conversion step. Because the PEALD process is cyclic and the plasma exposure step is repeated several times during a deposition process, some may refer to these conventional processes as pulsed plasma processes.
- the plasma must be turned on and off or otherwise modulated multiple times during a single plasma exposure/conversion operation.
- the high frequency RF power of the plasma may switch between an on state and an off state.
- the RF power may be reduced but not turned off during the pulses.
- the high frequency RF power pulses could be 100% of the high frequency RF power when the pulse is on and 50% of the high frequency RF power when the pulse is off.
- the high frequency RF power of the plasma may be increased over a period of time and decreased over a period of time instead of being turned on and off.
- the plasma pulses are generally very short, with a pulse frequency on the order of about 100 Hz-500 Hz, though values outside this range may be used as well.
- Films produced according to the disclosed methods show much higher quality at the sidewalls compared to conventionally deposited films. This increase in sidewall film quality means that the deposited films have much more uniform quality overall.
- the difference in film quality between the sidewalls of a feature and other areas of a feature in conventional PEALD methods may arise due to the nature of ion directionality.
- ions present in the plasma travel in a substantially linear manner to hit the surface of the substrate. These ions may provide energy for converting the precursor material(s).
- the density of ions impacting the substrate is much higher near the field region and at the bottom of a feature, as compared to the sidewalls. This may act to selectively density the film near the top and bottom of the feature, leaving a less dense film on the sidewalls.
- the energy delivered by ions hitting the sidewalls is different from the energy delivered by ions hitting other portions of the feature, again due to the geometry of the recessed feature. This may lead to different reactions happening at the sidewalls than at other regions.
- the use of a pulsed plasma may decrease the directionality of the ions, resulting in more uniform ion impact density/energy on the substrate, and more uniform film quality.
- the difference in film quality at different locations may also result from the ratio of ions to radicals in the plasma.
- a different amount, ratio and type of ions and neutrals may be achieved. This may help form a more uniform quality film.
- One plasma pulse cycle includes turning the plasma power on and off once (or off and on once).
- the power used to drive the RF plasma is shown in FIG. 1E .
- Plasma power is actively applied during the on period, but not during the off period.
- the on and off periods may be further broken down into specific processing regimes, including a turn on regime, a steady state regime, a turn off regime and a late afterglow regime.
- the electron energy, electron density, positive and negative ion fluxes, and plasma potential vary based which plasma cycle processing regime the plasma is currently experiencing.
- the turn on cycle begins upon application of plasma power. This period may last on the order of about 10-500 ⁇ s in some embodiments.
- plasma power When plasma power is applied, the electron energy in the plasma jumps and then quickly begins to fall. The density of electrons rises during this time.
- Plasmas generally contain ions, electrons and radicals. To satisfy the charge balance, more of the ions present in the plasma are positively charged than negatively charged. This is because positive ions are the only positive species in the plasma, while the negative species include both negative ions and electrons. Further, many plasmas, including electronegative plasmas, have an electropositive edge/sheath region.
- the density of positive ions is greater than the density of negative ions, and because the plasma sheath is electropositive, the flux of negative ions to the surface of a substrate while plasma is activated is very low (e.g., substantially zero).
- the plasma potential jumps and then begins to fall off.
- plasma sheaths may be forming and changing with plasma ignition.
- the electron energy is lower than it was during the turn on regime. Both electron energy and electron density are fairly constant.
- the positive and negative ion fluxes are also constant during this regime, with a high positive ion flux and a very low (e.g., substantially zero) negative ion flux.
- the plasma potential is fairly steady, and is lower in the steady state regime than during the turn on regime.
- plasma sheaths may be oscillating in a steady state fashion.
- the turn off processing regime begins as soon as the plasma power is turned off. During this period, the electron energy, electron density, positive ion flux and plasma potential all begin to fall off.
- the plasma sheaths may be disintegrating with the decline of the electron density during the turn off regime.
- the negative ion flux may rise during this processing regime.
- many plasmas have an electropositive edge region. In order to extract negative ions from the plasma, this edge region should be changed by reversing the direction of the electric field for a sufficiently long period of time to allow the negative ions to escape. To reverse the electric field, the electron current must be absorbed. This current can be very substantial in the context of a continuous wave plasma. However, this current decreases as the electron density decreases.
- the next processing regime experienced after the turn off regime is the late afterglow regime.
- the plasma power, electron energy, electron density, positive ion flux and plasma potential are very low, in some cases zero.
- the electron density is very low, for example near the thermal electron average energy.
- the ion flux density is similarly low, with little to no positive ions reaching the surface of a substrate. As indicated above, however, there may be a flux of negative ions to the surface of the substrate during this time. In some cases, the plasma potential may be zero or even negative during the late afterglow regime.
- film byproducts may get selectively buried in the film at different locations, particularly at the sidewalls.
- the use of a pulsed plasma may allow these byproducts to be removed from the film more effectively, thus creating a more uniform quality film.
- Pulsed plasmas have been used in certain other contexts for other purposes.
- a plasma may be pulsed during a plasma enhanced chemical vapor deposition process in order to enhance conformality of the deposited film.
- This pulsed PECVD process is further discussed and described in U.S. Pat. No. 7,745,346, titled “METHOD FOR IMPROVING PROCESS CONTROL AND FILM CONFORMALITY OF PECVD FILM,” which is incorporated herein in its entirety.
- ALD and CFD methods deposit films that are inherently very conformal, one of ordinary skill in the art would not likely apply these pulsed plasma methods to an ALD/CFD process, as there would be little or no expected benefit in this context.
- the deposited film may be an oxide (e.g., silicon oxide or a metal oxide). Each of these types of films suffers from poor quality film on the sidewalls when deposited according to conventional continuous wave plasma processing methods.
- the film deposited may be doped, for example with carbon, boron, phosphorus, nitrogen, etc.
- FIG. 2A shows a flowchart of a method of depositing a uniform-quality film according to various disclosed embodiments.
- the method 200 begins at operation 202 , where a substrate having recessed features is received into a reaction chamber.
- a dose of a first reactant is flowed into the reaction chamber.
- the reactant adsorbs onto the surface of the substrate, including in the recessed features.
- the first reactant is typically a silicon-containing reactant.
- the first reactant is generally a metal-containing reactant.
- the reaction chamber is purged at operation 206 .
- the purge includes sweeping the reaction chamber with a non-reactive gas.
- the purge may include evacuating the reaction chamber by performing a pump down.
- the pressure in the reaction chamber is significantly lower during the pump down than during reactant delivery, for example.
- the purpose of this purge operation 206 is to remove all or substantially all of the first reactant from the reaction chamber.
- the purge/sweep may be less complete, where only a portion of the first reactant is removed from the reaction chamber.
- Optimal purge conditions may depend on the desired film characteristics. Unless otherwise stated, a sweep or purge as described herein may be partial, complete or substantially complete. In certain implementations, this purge/sweep may not occur.
- a second reactant is flowed into the reaction chamber.
- the second reactant is often a nitrogen-containing reactant, carbon-containing reactant, and/or oxygen-containing reactant.
- Each of the first and second reactants may also be a mix of reactants.
- the second reactant may include both oxygen and nitrous oxide.
- the reactants may be mixed prior to delivery (e.g., in a separate mixing vessel), or after delivery (e.g., in the reaction chamber itself).
- a pulsed plasma is ignited in the reaction chamber and exposed to the substrate surface.
- the frequency of the pulses is relatively high, for example on the order of about 100-500 Hz.
- the pulsed plasma exposure operation 210 may have a longer duration than what is typically used in a conventional continuous wave plasma process.
- operations 208 and 210 occur, at least partially, at the same time.
- the second reactant may be pre-flowed into the reaction chamber at 208 before plasma ignition occurs at 210 .
- the second reactant is provided continuously.
- operations 208 and 210 begin at the same time.
- the second reactant is flowed into the reaction chamber at 208 , then swept/purged from the reaction chamber before pulsed plasma ignition occurs at operation 210 . In various cases, however, this purge may not occur.
- the plasma is extinguished and the reaction chamber is purged at operation 212 .
- this may include sweeping and/or pumping down the reaction chamber. In certain cases this sweep/purge may be optional, though the use of a post-plasma purge may help promote formation of high quality film.
- Operations 204 - 212 generally result in the deposition of a monolayer of material, though in certain embodiments, less than a monolayer of material may be deposited. These steps may be repeated a number of times in order to grow a film of the desired thickness, as indicated by the dotted arrow.
- the plasma characteristics can have a substantial effect on the deposited film.
- the plasma is a capacitively coupled plasma.
- other types of plasma may also be used, for example inductively coupled plasmas.
- Various types of plasma generators may be used including RF, DC and microwave plasma generators.
- the plasma may be either a direct plasma (i.e., a plasma generated in the reaction chamber), or a remotely-generated plasma.
- the high frequency RF power of a plasma may be pulsed between about 75-500 Hz. These generators are not capable of a sustaining a plasma at duty cycles lower than 15% or pulse frequencies greater than 500 Hz. Further improvements in the films might be observed using the pulsed PEALD process with further decreases in duty cycle when generators capable of higher frequencies and lower duty cycles become available.
- the high frequency RF power of the plasma must be on at least long enough to generate reactive species. If no reactive species are generated, the benefits of pulsed PEALD will not be realized.
- the plasma power delivered may be between about 50-2500 W/station, for example between about 75-500 W/station for a 300 mm diameter wafer. These values may be scaled linearly based on the area of a substrate for substrates of different sizes. For example, a value of 100 W/station for a 300 mm wafer would correspond to a value of 225 W/station for a 450 mm wafer.
- the RF frequency may include a low frequency (LF) component (e.g., about 250-400 kHz) and/or a high frequency (HF) component (e.g., about 13.56 or 27 MHz).
- LF low frequency
- HF high frequency
- the inclusion of an LF frequency undesirably reduces step coverage.
- the RF delivered includes only HF frequencies.
- the duty cycle relates to the relative amount of time that a plasma is ignited during the pulsed plasma exposure phase. For example, for a pulse with a frequency of 500 Hz and a duty cycle of 15%, one pulse period is 2 ms with the RF power off for 1.7 ms and on for 0.3 ms. In some embodiments, the duty cycle is between about 5-95%. In certain cases, the duty cycle is between about 5-50%, or between about 5-15%, for example about 10%. The duration of each plasma pulse is fairly short and the frequency of plasma pulses is relatively high. In some cases, the plasma pulse frequency is between about 25-5000 Hz, for example between about 100-500 Hz. In some cases, the pulse frequency is about 1000 Hz or less, for example about 500 Hz or less.
- the pulse frequency is about 25 Hz or greater, for example about 50 Hz or greater, or about 100 Hz or greater.
- the duration of the entire plasma exposure operation may be higher than in continuous wave plasma PEALD processes. In some cases, the duration of the pulsed plasma exposure is between about 0.05-2 seconds, for example between about 0.05-1 second, or between about 0.1-0.5 seconds.
- the plasma pulse characteristics may be changed over time.
- the pulse frequency and/or duty cycle may change between a first set of deposition cycles and a second set of deposition cycles.
- a pulse frequency is increased or decreased in later cycles.
- the duty cycle may increase or decrease in later cycles.
- Other plasma characteristics may change over time within a deposition process, as well. For instance, the RF power value, RF frequency, plasma generating gas, etc. may be changed during a deposition process.
- FIG. 2B provides a flowchart for a method of depositing a film on a substrate where the plasma conditions are changed during the deposition.
- the method 250 begins at operation 252 , where one or more layers of film are deposited using a deposition process utilizing pulsed plasma having a first set of plasma conditions, as described herein.
- the method 250 continues at operation 254 , where one or more additional film layers are deposited using a deposition process utilizing pulsed plasma having a second set of plasma conditions.
- the first and second set of plasma conditions may be different.
- one or more of the following plasma characteristics may be different between operations 252 and 254 : pulse frequency, duty cycle, RF power, RF frequency, composition or flow rate of gas used to generate plasma, etc. Changing the plasma characteristics may help tune a film as desired.
- the deposited film is a silicon-containing film.
- the silicon-containing reactant may be for example, a silane, a halosilane or an aminosilane.
- a silane contains hydrogen and/or carbon groups, but does not contain a halogen.
- silanes examples include silane (SiH 4 ), disilane (Si 2 H 6 ), and organo silanes such as methylsilane, ethylsilane, isopropylsilane, t-butylsilane, dimethylsilane, diethylsilane, di-t-butylsilane, allylsilane, sec-butylsilane, thexylsilane, isoamylsilane, t-butyldisilane, di-t-butyldisilane, tetra-ethyl-ortho-silicate (also known as tetra-ethoxy-silane or TEOS) and the like.
- organo silanes such as methylsilane, ethylsilane, isopropylsilane, t-butylsilane, dimethylsilane, diethylsilane, di-t-butyl
- halosilane contains at least one halogen group and may or may not contain hydrogens and/or carbon groups.
- halosilanes are iodosilanes, bromosilanes, chlorosilanes and fluorosilanes.
- halosilanes, particularly fluorosilanes may form reactive halide species that can etch silicon materials, in certain embodiments described herein, the silicon-containing reactant is not present when a plasma is struck.
- chlorosilanes are tetrachlorosilane (SiCl 4 ), trichlorosilane (HSiCl 3 ), dichlorosilane (H 2 SiCl 2 ), monochlorosilane (ClSiH 3 ), chloroallylsilane, chloromethylsilane, dichloromethylsilane, chlorodimethylsilane, chloroethylsilane, t-butylchlorosilane, di-t-butylchlorosilane, chloroisopropylsilane, chloro-sec-butylsilane, t-butyldimethylchlorosilane, thexyldimethylchlorosilane, and the like.
- aminosilane includes at least one nitrogen atom bonded to a silicon atom, but may also contain hydrogens, oxygens, halogens and carbons.
- Examples of aminosilanes are mono-, di-, tri- and tetra-aminosilane (H 3 Si(NH 2 ) 4 , H 2 Si(NH 2 ) 2 , HSi(NH 2 ) 3 and Si(NH 2 ) 4 , respectively), as well as substituted mono-, di-, tri- and tetra-aminosilanes, for example, t-butylaminosilane, methylaminosilane, tert-butylsilanamine, bis(tertiarybutylamino)silane (SiH 2 (NHC(CH 3 ) 3 ) 2 (BTBAS), tert-butyl silylcarbamate, SiH(CH 3 )—(N(CH 3 ) 2 ) 2 , SiHCl—(N(CH 3 ) 2 )
- the deposited film contains metal.
- metal-containing films that may be formed include oxides and nitrides of aluminum, titanium, hafnium, tantalum, tungsten, manganese, magnesium, strontium, etc., as well as elemental metal films.
- Example precursors may include metal alkylamines, metal alkoxides, metal alkylamides, metal halides, metal ⁇ -diketonates, metal carbonyls, organometallics, etc. Appropriate metal-containing precursors will include the metal that is desired to be incorporated into the film.
- a tantalum-containing layer may be deposited by reacting pentakis(dimethylamido)tantalum with ammonia or another reducing agent.
- metal-containing precursors include trimethylaluminum, tetraethoxytitanium, tetrakis-dimethyl-amido titanium, tetrakis-diethylamido-titanium, titanium isopropoxide, titanium tetraisopropoxide, titanium tetrachloride, bis(methyl- ⁇ 5-cyclopentadienyl)dimethylhafnium, bis(methyl- ⁇ 5-cyclopentadienyl)methoxymethylhafnium, hafnium(IV) tert-butoxide, tetrakis(dimethylamido)hafnium(IV), hafnium tetrakis(ethylmethylamide), bis(cyclopentadienyl)manganese, bis(n-propylcyclopentadienyl)magnesium, tantalum(V) ethoxide, tris(diethylamido
- an oxygen-containing reactant is used.
- oxygen-containing reactants include oxygen, ozone, nitrous oxide, nitric oxide, nitrogen dioxide, carbon monoxide, carbon dioxide, sulfur monoxide, sulfur dioxide, water, oxygen-containing hydrocarbons (C x H y O z ), etc.
- the deposited film contains nitrogen, and a nitrogen-containing reactant is used.
- a nitrogen-containing reactant contains at least one nitrogen, for example, ammonia, hydrazine, amines (e.g., amines bearing carbon) such as methylamine, dimethylamine, ethylamine, isopropylamine, t-butylamine, di-t-butylamine, cyclopropylamine, sec-butylamine, cyclobutylamine, isoamylamine, 2-methylbutan-2-amine, trimethylamine, diisopropylamine, diethylisopropylamine, di-t-butylhydrazine, as well as aromatic containing amines such as anilines, pyridines, and benzylamines.
- amines e.g., amines bearing carbon
- Amines may be primary, secondary, tertiary or quaternary (for example, tetraalkylammonium compounds).
- a nitrogen-containing reactant can contain heteroatoms other than nitrogen, for example, hydroxylamine, t-butyloxycarbonyl amine and N-t-butyl hydroxylamine are nitrogen-containing reactants.
- the disclosed embodiments will be beneficial in achieving uniform film quality in recessed features.
- the methods may also be used to deposit films on other types of substrates (e.g., flat substrates, or substrates having protruding features).
- substrates e.g., flat substrates, or substrates having protruding features.
- the need for the improved sidewall quality and overall film uniformity may not be as great in the context of these types of non-recessed substrates.
- the substrate includes one or more recessed features having aspect ratios of about 6:1 or less. This ratio is defined as the depth:width of the recessed feature. In other cases, the aspect ratio of the features may be higher.
- the temperature of the reaction chamber during the deposition process may be between about 150-550° C., for example between about 250-550° C. This temperature is substantially lower than that typically required when thermal energy is used to convert the precursors (e.g., >700° C.), rather than plasma energy.
- the pressure of the reaction chamber during the deposition process may be between about 1-10 Torr, or between about 3-7 Torr, for example about 6 Torr.
- the disclosed pulsed plasma embodiments will typically exhibit a slower deposition rate.
- the disclosed methods also result in the deposition of films having relatively tensile or neutral stress with very low wet etch rates.
- conventional methods typically result in the deposition of compressive films having low wet etch rates or tensile films having very high wet etch rates.
- the wet etch rate can be varied by using different levels of RF power. Higher levels of RF power (e.g., about 6500 W/station) result in highly compressive films having low wet etch rates. Lower levels of RF power (e.g., about 500 W/station) result in films that are less compressive/more tensile, however, these films have extremely high wet etch rates.
- the wet etch rate of the film as-deposited at the middle portion of a sidewall may be between about 1-25 ⁇ /min, for example between about 1-10 ⁇ /min. These values may be especially relevant when the film deposited is a carbon doped silicon nitride film.
- Another way to characterize the deposited films is to examine internal wet etch rate ratios that compare the wet etch rates at different portions of the deposited film.
- the wet etch rate at the middle portion of the feature's sidewall (WE m ) may be compared to the wet etch rate at the bottom (WE b ) and/or top (WE t ) of the feature.
- WE m /WE b and/or WE m /WE t are between about 0.25-3, for example between about 0.25-2, or between about 0.25-1. In the case of a continuous wave plasma, these ratios are generally much higher, for example between about 5-10 or greater.
- the stress of the as-deposited film may vary widely, for example the stress may be between about 500 MPa tensile and about 2 GPa compressive.
- Pulsed plasma processing can be performed with existing semiconductor processing equipment by using a high frequency RF generator capable of pulsing the high frequency and/or low frequency RF power of the plasma.
- reactors such as VectorTM reactor chambers available from Lam Research Corporation of Fremont, Calif., may be used for pulsed PEALD.
- improved films may be made with minimal hardware alterations.
- a suitable apparatus for performing the disclosed methods typically includes hardware for accomplishing the process operations and a system controller having instructions for controlling process operations in accordance with the present invention.
- the hardware may include one or more PEALD process stations included in a process tool.
- FIG. 3 provides a block diagram of an example apparatus that may be used to practice the disclosed embodiments.
- a reactor 300 includes a process chamber 324 , which encloses other components of the reactor and serves to contain the plasma generated by, e.g., a capacitor type system including a showerhead 314 working in conjunction with a grounded heater block 320 .
- a high-frequency RF generator 304 connected to a matching network 306 , and a low-frequency RF generator 302 are connected to showerhead 314 . These RF generators are capable of pulsing a plasma as described herein.
- the power and frequency supplied by matching network 306 is sufficient to generate a plasma from the process gas, for example 400-700 W total energy.
- both the HFRF generator and the LFRF generator are used.
- the high frequency RF component is generally between about 2-60 MHz; in a preferred embodiment, the HF component is about 13.56 MHz or 27 MHz.
- the low frequency LF component is generally between about 250-400 kHz; in a particular embodiment, the LF component is about 350 kHz.
- a wafer pedestal 318 supports a substrate 316 .
- the pedestal typically includes a chuck, a fork, or lift pins to hold and transfer the substrate during and between the deposition and/or plasma treatment reactions.
- the chuck may be an electrostatic chuck, a mechanical chuck or various other types of chuck as are available for use in the industry and/or research.
- the process gases are introduced via inlet 312 .
- Multiple source gas lines 310 are connected to manifold 308 .
- the gases may be premixed or not.
- Appropriate valving and mass flow control mechanisms are employed to ensure that the correct gases are delivered during the deposition and plasma treatment phases of the process.
- liquid flow control mechanisms are employed. The liquid is then vaporized and mixed with other process gases during its transportation in a manifold heated above its vaporization point before reaching the deposition chamber.
- a vacuum pump 326 e.g., a one or two stage mechanical dry pump and/or a turbomolecular pump typically draws process gases out and maintains a suitably low pressure within the reactor by a close loop controlled flow restriction device, such as a throttle valve or a pendulum valve.
- the invention may be implemented on a multi-station or single station tool.
- the 300 mm Novellus VectorTM tool having a 4-station deposition scheme or the 200 mm SequelTM tool having a 6-station deposition scheme are used. It is possible to index the wafers after every deposition and/or post-deposition plasma anneal treatment until all the required depositions and treatments are completed, or multiple depositions and treatments can be conducted at a single station before indexing the wafer. It has been shown that film stress is the same in either case. However, conducting multiple depositions/treatments on one station is substantially faster than indexing following each deposition and/or treatment.
- FIG. 4 shows a schematic view of an embodiment of a multi-station processing tool 2400 with an inbound load lock 2402 and an outbound load lock 2404 , either or both of which may comprise a remote plasma source.
- a robot 2406 at atmospheric pressure, is configured to move wafers from a cassette loaded through a pod 2408 into inbound load lock 2402 via an atmospheric port 2410 .
- a wafer is placed by the robot 2406 on a pedestal 2412 in the inbound load lock 2402 , the atmospheric port 2410 is closed, and the load lock is pumped down.
- the inbound load lock 2402 comprises a remote plasma source
- the wafer may be exposed to a remote plasma treatment in the load lock prior to being introduced into a processing chamber 2414 .
- the wafer also may be heated in the inbound load lock 2402 as well, for example, to remove moisture and adsorbed gases.
- a chamber transport port 2416 to processing chamber 2414 is opened, and another robot (not shown) places the wafer into the reactor on a pedestal of a first station shown in the reactor for processing. While the embodiment depicted in FIG. 4 includes load locks, it will be appreciated that, in some embodiments, direct entry of a wafer into a process station may be provided.
- the depicted processing chamber 2414 comprises four process stations, numbered from 1 to 4 in the embodiment shown in FIG. 4 .
- Each station has a heated pedestal (shown at 2418 for station 1 ), and gas line inlets. It will be appreciated that in some embodiments, each process station may have different or multiple purposes. While the depicted processing chamber 2414 comprises four stations, it will be understood that a processing chamber according to the present disclosure may have any suitable number of stations. For example, in some embodiments, a processing chamber may have five or more stations, while in other embodiments a processing chamber may have three or fewer stations.
- FIG. 4 also depicts an embodiment of a wafer handling system 2490 for transferring wafers within processing chamber 2414 .
- wafer handling system 2490 may transfer wafers between various process stations and/or between a process station and a load lock. It will be appreciated that any suitable wafer handling system may be employed. Non-limiting examples include wafer carousels and wafer handling robots.
- FIG. 4 also depicts an embodiment of a system controller 2450 employed to control process conditions and hardware states of process tool 2400 .
- System controller 2450 may include one or more memory devices 2456 , one or more mass storage devices 2454 , and one or more processors 2452 .
- Processor 2452 may include a CPU or computer, analog and/or digital input/output connections, stepper motor controller boards, etc.
- system controller 2450 controls all of the activities of process tool 2400 .
- System controller 2450 executes system control software 2458 stored in mass storage device 2454 , loaded into memory device 2456 , and executed on processor 2452 .
- System control software 2458 may include instructions for controlling the timing, mixture of gases, chamber and/or station pressure, chamber and/or station temperature, purge conditions and timing, wafer temperature, RF power levels, RF frequencies, substrate, pedestal, chuck and/or susceptor position, and other parameters of a particular process performed by process tool 2400 .
- System control software 2458 may be configured in any suitable way. For example, various process tool component subroutines or control objects may be written to control operation of the process tool components necessary to carry out various process tool processes in accordance with the disclosed methods.
- System control software 2458 may be coded in any suitable computer readable programming language.
- system control software 2458 may include input/output control (IOC) sequencing instructions for controlling the various parameters described above.
- IOC input/output control
- each phase of a PEALD process may include one or more instructions for execution by system controller 2450 .
- the instructions for setting process conditions for a PEALD process phase may be included in a corresponding PEALD recipe phase.
- the PEALD recipe phases may be sequentially arranged, so that all instructions for a PEALD process phase are executed concurrently with that process phase.
- mass storage device 2454 and/or memory device 2456 associated with system controller 2450 may be employed in some embodiments.
- programs or sections of programs for this purpose include a substrate positioning program, a process gas control program, a pressure control program, a heater control program, and a plasma control program.
- a substrate positioning program may include program code for process tool components that are used to load the substrate onto pedestal 2418 and to control the spacing between the substrate and other parts of process tool 2400 .
- a process gas control program may include code for controlling gas composition and flow rates and optionally for flowing gas into one or more process stations prior to deposition in order to stabilize the pressure in the process station.
- a pressure control program may include code for controlling the pressure in the process station by regulating, for example, a throttle valve in the exhaust system of the process station, a gas flow into the process station, etc.
- a heater control program may include code for controlling the current to a heating unit that is used to heat the substrate.
- the heater control program may control delivery of a heat transfer gas (such as helium) to the substrate.
- a plasma control program may include code for setting RF power levels and frequencies applied to the process electrodes in one or more process stations.
- the plasma control program may also include code for controlling the plasma duty cycle and the frequency of plasma pulses during a plasma exposure/conversion operation.
- the user interface may include a display screen, graphical software displays of the apparatus and/or process conditions, and user input devices such as pointing devices, keyboards, touch screens, microphones, etc.
- parameters adjusted by system controller 2450 may relate to process conditions.
- process conditions include process gas composition and flow rates, temperature, pressure, plasma conditions (such as RF bias power levels), pressure, temperature, etc. These parameters may be provided to the user in the form of a recipe, which may be entered utilizing the user interface.
- Signals for monitoring the process may be provided by analog and/or digital input connections of system controller 2450 from various process tool sensors.
- the signals for controlling the process may be output on the analog and digital output connections of process tool 2400 .
- process tool sensors that may be monitored include mass flow controllers, pressure sensors (such as manometers), thermocouples, etc. Appropriately programmed feedback and control algorithms may be used with data from these sensors to maintain process conditions.
- System controller 2450 may provide program instructions for implementing the above-described deposition processes.
- the program instructions may control a variety of process parameters, such as DC power level, RF power level, RF bias power level, RF frequency, plasma pulse frequency, pressure, temperature, etc.
- the instructions may control the parameters to operate in-situ deposition of film stacks according to various embodiments described herein.
- Lithographic patterning of a film typically comprises some or all of the following steps, each step enabled with a number of possible tools: (1) application of photoresist on a workpiece, e.g., a substrate having a silicon nitride film formed thereon, using a spin-on or spray-on tool; (2) curing of photoresist using a hot plate or furnace or other suitable curing tool; (3) exposing the photoresist to visible or UV or x-ray light with a tool such as a wafer stepper; (4) developing the resist so as to selectively remove resist and thereby pattern it using a tool such as a wet bench or a spray developer; (5) transferring the resist pattern into an underlying film or workpiece by using a dry or plasma-assisted etching tool; and (6) removing the resist using a tool such as an RF or microwave plasma resist stripper.
- an ashable hard mask layer such as an amorphous carbon layer
- another suitable hard mask such as an antireflective
- FIGS. 5A and 5B and 6 A and 6 B show cross-sectional views of silicon carbonitride films deposited in trenches on a semiconductor substrate as deposited and after etching in 100:1 water:HF for 90 seconds.
- FIGS. 5C and 6C show tables relating the etch properties of the films shown in FIGS. 5A and 5B and 6 A and 6 B, respectively.
- FIG. 5A shows an as-deposited conventional film.
- FIG. 5B shows this same film after etching.
- FIG. 5C shows that the etch rate at the side of the feature was substantially higher than the etch rate at the top of the feature, which was higher than the etch rate at the bottom of the feature. In this case, the etch rate at the sidewall of the feature was approximately ten times higher than the etch rate at the bottom of the feature. Thus, it is apparent that the film at the sidewalls is of poorer quality than the film in other areas of the feature.
- FIG. 6A shows an as-deposited film that was deposited according to the disclosed methods, with a pulsed plasma.
- the plasma was pulsed at a frequency of about 500 Hz.
- FIG. 6B shows this same film after it was etched.
- FIG. 6C relates the wet etch rate of the film shown in FIGS. 6A and 6B .
- the wet etch rate at the sidewall is substantially lower than in the conventional case, and the uniformity of the wet etch rate at different portions of the film is significantly improved.
- FIGS. 7A and 7B illustrate relative areal density maps for carbon and silicon as measured by STEM-EELs analysis for film deposited with a continuous wave plasma ( FIG. 7A ) and for film deposited with a pulsed plasma ( FIG. 7B ). These figures are presented in color for the purpose of illustrating the C:Si ratio at different portions of the deposited films. When comparing the sidewalls of the two films, it is clear that the pulsed plasma film has a higher C:Si ratio than the film prepared with a continuous wave plasma. This higher sidewall C:Si ratio is consistent with the lower wet etch rate observed at the sidewalls of features deposited with pulsed plasma film.
- the sidewalls of the film have a C:Si ratio of at least about 0.4 or 0.5 or 0.6 (on average, as measured in the substantially vertical section of the sidewall, and as measured according to a STEM-EELs analysis in accordance with the figures, or an equivalent analysis).
- the average sidewall C:Si ratio for the pulsed plasma film is about 0.65
- the continuous wave film in FIG. 7B has an average sidewall C:Si ratio of about 0.35.
Abstract
Description
Claims (19)
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KR1020140193925A KR102384484B1 (en) | 2013-12-30 | 2014-12-30 | Plasma enhanced atomic layer deposition with pulsed plasma exposure |
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